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Boeing 737-8AS, EI-DLR

Summary:

A cross-bleed engine start procedure was initiated prior to the completion of the aircraft pushback. As the power was increased on the No 1 engine in preparation for the No 2 engine start, the resulting increase in thrust was greater than the counter-force provided by the tug and the aircraft started to move forwards. The towbar attachment failed and subsequently the aircraft’s No 1 engine impacted the side of the tug, prior to the aircraft brakes being applied.